In Sunday's Washington Post, Byron York will ask the musical question, John McCain: Can He Be A Falwell Republican?

Silly question. He already is one.

McCain's visit to Liberty University is indeed a conciliatory signal not just to Falwell but to millions of Christian conservatives who question the depth of McCain's commitment on issues such as abortion and same-sex marriage. But it is as much a chance for Falwell and his supporters to assert their influence in the Republican Party -- an influence that has waned in recent years.

Expediency overrides principle. We KNOW McCain is aware of the racist slurs and other nastiness Bush pulled in 2000.

The premise of any smear campaign rests on a central truth of politics: Most of us will vote for a candidate we like and respect, even if we don't agree with him on every issue. But if you can cripple a voter's basic trust in a candidate, you can probably turn his vote. The idea is to find some piece of personal information that is tawdry enough to raise doubts, repelling a candidate's natural supporters.

All campaigns do extensive research into their opponent's voting record and personal life. This so-called "oppo research" involves searching databases, combing through press clips, and asking questions of people who know (and preferably dislike) your opponent. It's not hard to turn up something a candidate would rather not see on the front page of The Boston Globe.

It's not necessary, however, for a smear to be true to be effective. The most effective smears are based on a kernel of truth and applied in a way that exploits a candidate's political weakness.

Having run Senator John McCain's campaign for president, I can recount a textbook example of a smear made against McCain in South Carolina during the 2000 presidential primary. We had just swept into the state from New Hampshire, where we had racked up a shocking, 19-point win over the heavily favored George W. Bush. What followed was a primary campaign that would make history for its negativity.

In South Carolina, Bush Republicans were facing an opponent who was popular for his straight talk and Vietnam war record. They knew that if McCain won in South Carolina, he would likely win the nomination. With few substantive differences between Bush and McCain, the campaign was bound to turn personal. The situation was ripe for a smear.

It didn't take much research to turn up a seemingly innocuous fact about the McCains: John and his wife, Cindy, have an adopted daughter named Bridget. Cindy found Bridget at Mother Theresa's orphanage in Bangladesh, brought her to the United States for medical treatment, and the family ultimately adopted her. Bridget has dark skin.

Anonymous opponents used "push polling" to suggest that McCain's Bangladeshi born daughter was his own, illegitimate black child. In push polling, a voter gets a call, ostensibly from a polling company, asking which candidate the voter supports. In this case, if the "pollster" determined that the person was a McCain supporter, he made statements designed to create doubt about the senator.

Thus, the "pollsters" asked McCain supporters if they would be more or less likely to vote for McCain if they knew he had fathered an illegitimate child who was black. In the conservative, race-conscious South, that's not a minor charge.

And McCain's response?

That's not only personally sad, it's a sign that McCain understands and accepts race card politics.

AMY GOODMAN: Do you think this is similar to the attacks on you in 2000, the Bush attacks in 2000?

JOHN MCCAIN: No, I put the attacks behind me. The attacks that were made on me are long ago and far away, and I don't ever think about them or dwell on them.

AMY GOODMAN: They were very personal, very harsh, and they questioned your war record.

JOHN MCCAIN: And I had to get over it. And I got over it, and I don't look back in anger. I look back as running for president as the greatest experience of my life.

AMY GOODMAN: It's one thing to get over it. It's another to stand with and campaign with the man who did it to you, George Bush.

JOHN MCCAIN: I put it behind me. I put it behind me. Absolutely, we have a very good, friendly relationship.

AMY GOODMAN: Has he ever explained himself to you, why he attacked your wife, Cindy, and your kid?

JOHN MCCAIN: I can only––my discussions with the president are private. Okay? Thanks, good.

Now that the Straight-Talk Express is stopping at Falwell's Liberty University, the question of his being a principled politician is settled. The only question left from a Black partisan perspective is how much disrespect can we expect from him? Bob Jones University, anyone?